99217478 has 4 divisors (see below), whose sum is σ = 148826220. Its totient is φ = 49608738.

The previous prime is 99217477. The next prime is 99217511. The reversal of 99217478 is 87471299.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99217471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24804368 + ... + 24804371.

It is an arithmetic number, because the mean of its divisors is an integer number (37206555).

Almost surely, 2^99217478 is an apocalyptic number.

99217478 is a deficient number, since it is larger than the sum of its proper divisors (49608742).

99217478 is a wasteful number, since it uses less digits than its factorization.

99217478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49608741.

The product of its digits is 254016, while the sum is 47.

The square root of 99217478 is about 9960.7970564609. The cubic root of 99217478 is about 462.9449963970.

The spelling of 99217478 in words is "ninety-nine million, two hundred seventeen thousand, four hundred seventy-eight".